see:

?sample

library(vegan)

?rrarefy

not knowing your data structure, its hard to say.

camilleislande wrote

>

> Hello

> I have several populations where I have morphology and diet for each

> individual. I am interested in the correlation between diet and

> morphological distances. However the number of individuals in each

> population ranges from 22 to 80 individuals. I have looked at the

> correlation diet-morphology for each population and (not surprisingly) the

> correlation coefficientis is highly correlated with the number of

> individuals per population.

>

> I would like to resample (without replacement) the populations with 60-80

> individuals and get random samplings of 30 individuals (1000 times). I

> would like to get a correlation coefficient distribution against which to

> test the original value of the correlation.

>

> I guess it is possible do this, however I have never written a script in R

> and I am not familiar with resampling techniques at all. Any help with

> coding will be greatly appreciated

>

> Thank you

>

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